I'm a UPS distributor and I have a customer that we sold a UPS for switches, the UPS that we sold is a 2000va/1200watts pure sine wave. The situation is that if we disconnect the UPS from the AC power the switches keeps working with no problem. the thing is that the customer says that sometimes with the switches connected to the UPS for some reason there is a blink on the AC power and the switches goes off and then back on in mil seconds. He keeps saying that is a problem of the UPS but we haven't got any complaint from any of our other customers. Does any one have an answer to this problem?, It is very important to us to try to give an answer to our customer. Will appreciate your input.
Thanks
Jose